Opening a Textfile in MATLAB Appdesigner Online

I wrote data in matlab online and saved it as a textfile and I want to open that data in appdesigner online.

function InputDataButtonPushed(app, event)
            [filename, path] = uigetfile('*.txt'); % Choose the file to open
            
            if isequal(filename,0);
                return
            end
            
            figure(app.UIFigure);
            T = fopen(filename);
            

I am not getting an error code, but this is what it says for T

            T =

     3

and this is what I have for T in the file:

     1 1 1

I do not have an error message, so I really do not know what I am doing wrong.

I just want to open up the data into my numeric edit fields.

Answer 1

[Voss]

fopen merely opens a file so that subsequent code can read from or write to the file.

To read the contents of a file into a variable, you might try readmatrix or another function, depending on the contents of your file.

[I]

I tried it and it did nothing. I tried it again on desktop and got an error that I do not understand how to deal with

Here is my code

            function InputDataButtonPushed(app, event)
            [filename, path] = uigetfile('*.txt'); % Choose the file to open
            
            figure(app.UIFigure);
            
            T = readmatrix(filename); % Input data set 1
            
                    end
    end

I just want to open the file with the data to read in to my value edit fields.

    1 1 1

[Voss]

T = readmatrix(filename); % Input data set 1

reads the file filename into the variable T.

If you want your GUI to update somehow after this happens, you have to tell it to do so. For instance:

T = readmatrix(filename); % Input data set 1

% use your edit field's name.
% use what you want from T.
app.my_edit_field.Value = T(1);

[I]

Right, well I added these lines and then I have this error for it.

Are you able to explain why I am not able to just directly read in the data from the textfile using this function?

app.Var1EditField.Value = T(1,1);

'Value' must be a double scalar within the range of 'Limits'.

app.Var1EditField.Value = T(1);

'Value' must be a double scalar within the range of 'Limits'.